Same thing is happening to me when I try to update from 5.3.0 to 5.4.0 – hoping someone can help here?

The person you quoted was running into this problem on a Windows PC both when connecting with USB and Bluetooth.  Is this actually the platform you are using and how you're connecting to your H9?  If not, what is?  Also, when you turn your H9 on does the display light up immediately or is there a 10 second delay before it lights up?